Update go dependencies

vendor/sigs.k8s.io/kustomize/pkg/git/cloner.go

@@ -0,0 +1,75 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package git
+
+import (
+	"bytes"
+	"os/exec"
+
+	"github.com/pkg/errors"
+	"sigs.k8s.io/kustomize/pkg/fs"
+)
+
+// Cloner is a function that can clone a git repo.
+type Cloner func(repoSpec *RepoSpec) error
+
+// ClonerUsingGitExec uses a local git install, as opposed
+// to say, some remote API, to obtain a local clone of
+// a remote repo.
+func ClonerUsingGitExec(repoSpec *RepoSpec) error {
+	gitProgram, err := exec.LookPath("git")
+	if err != nil {
+		return errors.Wrap(err, "no 'git' program on path")
+	}
+	repoSpec.cloneDir, err = fs.NewTmpConfirmedDir()
+	if err != nil {
+		return err
+	}
+	cmd := exec.Command(
+		gitProgram,
+		"clone",
+		repoSpec.CloneSpec(),
+		repoSpec.cloneDir.String())
+	var out bytes.Buffer
+	cmd.Stdout = &out
+	err = cmd.Run()
+	if err != nil {
+		return errors.Wrapf(err, "trouble cloning %s", repoSpec.raw)
+	}
+	if repoSpec.ref == "" {
+		return nil
+	}
+	cmd = exec.Command(gitProgram, "checkout", repoSpec.ref)
+	cmd.Dir = repoSpec.cloneDir.String()
+	err = cmd.Run()
+	if err != nil {
+		return errors.Wrapf(
+			err, "trouble checking out href %s", repoSpec.ref)
+	}
+	return nil
+}
+
+// DoNothingCloner returns a cloner that only sets
+// cloneDir field in the repoSpec.  It's assumed that
+// the cloneDir is associated with some fake filesystem
+// used in a test.
+func DoNothingCloner(dir fs.ConfirmedDir) Cloner {
+	return func(rs *RepoSpec) error {
+		rs.cloneDir = dir
+		return nil
+	}
+}